Figure 2

Spatial configurations of the genes in the individual-based model. This scheme illustrates the case G _T =5 in 2D. In the uniform configuration, the 15 gene copies are positioned at independent randomly-chosen lattice sites, whereas in the clustered and segregated configurations, we start by positioning internal boxes of linear size r at random positions in the lattice, and place the gene copies inside the boxes. In the clustered configuration, each box contains one copy of each gene type i {0,1,2}, randomly positioned, while in the segregated configuration, each box receives all the G _T copies of gene 0,1 or 2, positioned at randomly chosen locations. When the internal box size r tends to the lattice size R, both clustered and segregated configurations converge to the uniform configuration.